.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
.\"
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.\" References consulted:
.\"     Linux libc source code
.\"     Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
.\"     386BSD man pages
.\" Modified Sat Jul 24 17:59:03 1993 by Rik Faith (faith@cs.unc.edu)
.TH STRSIGNAL 3  2016-03-15 "GNU" "Linux Programmer's Manual"
.SH NAME
strsignal \- return string describing signal
.SH SYNOPSIS
.nf
.B #include <string.h>
.sp
.BI "char *strsignal(int " sig );
.sp
.BI "extern const char * const " sys_siglist [];
.fi
.sp
.in -4n
Feature Test Macro Requirements for glibc (see
.BR feature_test_macros (7)):
.in
.sp
.BR strsignal ():
.PD 0
.ad l
.RS 4
.TP 4
Since glibc 2.10:
_POSIX_C_SOURCE\ >=\ 200809L
.TP
Before glibc 2.10:
_GNU_SOURCE
.RE
.ad
.PD
.SH DESCRIPTION
The
.BR strsignal ()
function returns a string describing the signal
number passed in the argument
.IR sig .
The string can be used only until the next call to
.BR strsignal ().
.PP
The array
.I sys_siglist
holds the signal description strings
indexed by signal number.
The
.BR strsignal ()
function should be
used if possible instead of this array.
.SH RETURN VALUE
The
.BR strsignal ()
function returns the appropriate description
string, or an unknown signal message if the signal number is invalid.
On some systems (but not on Linux), NULL may instead be
returned for an invalid signal number.
.SH ATTRIBUTES
For an explanation of the terms used in this section, see
.BR attributes (7).
.TS
allbox;
lb lb lbw31
l l l.
Interface	Attribute	Value
T{
.BR strsignal ()
T}	Thread safety	MT-Unsafe race:strsignal locale
.TE

.SH CONFORMING TO
POSIX.1-2008.
Present on Solaris and the BSDs.
.SH SEE ALSO
.BR psignal (3),
.BR strerror (3)
